New insights into the glacial and relative sea-level history of the western Fraser Lowland based on sediment cores from geotechnical drilling for the Evergreen Tunnel, British Columbia, Canada
Bibliographic Data
| ID | 24088283 |
|---|---|
| Authors | L E Jackson (0000-0002-5656-429X, Simon Fraser University), Brent Ward (0000-0001-6482-7283, Simon Fraser University, corresponding author), Brent C Ward, Stephen R Hicock (Western University), Raphael Gromig (0000-0001-9217-4259, Simon Fraser University), John J Clague (0000-0002-2697-2233, Simon Fraser University), Derek Turner (Douglas College), Derek G Turner |
| Year | 2024 |
| Volume | 122 |
| Pages | 40-61 |
| Publication date | 2024-11-01 |
| Peer Reviewed | Yes |
| Open Access | Yes |
| Type | ARTICLE |
| Venue | Quaternary Research (JOURNAL) |
| Journal identifiers | ISSN: 0033-5894 • E-ISSN: 1096-0287 |
| Publisher | Cambridge University Press (CUP) (PUBLISHER) |
| DOI | 10.1017/qua.2024.9 |
| OpenAlex | W4400243476 |
| Language | EN |
| Citations received | 1 |
| References cited | 43 |
Geotechnical drilling for a tunnel between Port Moody and Burnaby, BC, Canada, uncovered a buried fjord. Its sedimentary fill has a thickness of at least 130 m and extends more than 37 m below present mean sea level. Recovered sediments record cyclical growth and decay of successive Cordilleran ice sheets. The oldest sediments comprise 58 m of almost stoneless silt conformably overlying ice-proximal sediments and till, which in turn overlie bedrock. These sediments may predate Marine Isotope Stage (MIS) 4. Glacial sediments assigned to MIS 4 overlie this basal succession and, in turn, are overlain by MIS 3 interstadial sediments and sediments from two MIS 2 glacial advances. Indicators of relative sea-level elevations that bracket glacial deposits of MIS 4 and 2 indicate the cyclic existence of moat-like isostatic depressions in the front of expanding ice sheets. Compared with present sea level, these depressions were at least 160 m during the onsets of MIS 4 and MIS 2. Assuming a maximum eustatic drawdown of 120 m during MIS 2, isostatic depression may have exceeded 200 m during retreat of glacial ice from the Evergreen tunnel area. This is consistent with region-specific low mantle viscosity and rapid Cordilleran Ice Sheet buildup and wasting.
Drilling · Earth science · Geomorphology · Glacial period · Physical geography · Post-glacial rebound · Sediment · Climate change and permafrost · Geology · Geology and Paleoclimatology Research · Landslides and related hazards · Oceanography
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| Unique citing works | 1 |
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| Citations per year | 1 |
| Citation span | 2025 - 2025 (1) |
| Citation velocity | recent |
| Highly cited | No |
| Citation types | Neutral: 1 |